Denver weather forecast for today, March 19: Summer again This is still happening, Denver. Ashley Dean Mar 19 2017 · 6:00 a.m. Mar 19 2017 · 6:00 a.m. Share Tweet Email (Ashley Dean/Denverite) This is still happening, Denver. It doesn’t feel real, but it’s going to be around 80 degrees at the hottest and mostly sunny tomorrow, according to the National Weather Service. The overnight low will be around 47 Enjoy it. Wear sunscreen.